For Exterior

Fungicidal Wash


Ronseal's Masonry Fungicidal Wash is a powerful active agent that works to remove mould and algae from your exterior and masonry walls. Its deep cleaning surfactants revive and brighten the surface to restore its natural appearance and prepares and cleans your masonry surfaces before painting.

  • Powerful active agent that removes mould and algae
  • Fast acting in minutes
  • Cleans and prepares masonry surfaces
  • Ready to use
  • Protects against regrowth
  • Remove mould and algae
  • Fast acting in minutes
  • Cleans and prepares your masonry
Product Image
Coverage Calculator

Can be used on the following surfaces
  • Masonry
  • Brick
  • Interior & Exterior stone & concrete
    Interior & Exterior stone & concrete

1 colour available including:


How do I use it?

Number of coats

Requires one application


This bottle will cover 20-24m2


Stiff brush

How to use our Fungicidal Wash

Before you start

Clean any debris and accumulations of moss, mould and algae using a stiff brush.
Protect the surrounding plants or grass with a dust sheet. Masonry Fungicidal Wash may remove partially deteriorated coatings.


Pour some of the Fungicidal Wash directly onto your stiff brush and scrub the surface.  Leave it alone for 15-20 minutes.

Use a pressure washer to wash off the cleaner and remove dirt.

If you don’t have a pressure washer, scrub the surface with a stiff brush and hose it down.

Make sure you remove all cleaning residue for the best results.


Don’t allow undiluted product to enter drains or watercourses. For information on how to properly dispose of your cleaner, get in contact with your local council.


Technical Specification


Exterior walls and masonry

Coverage: The bottle will cover 20-24m2
Dry time: 15-20 minutes
Number of coats: 1
Colours: Clear
Application: Stiff brush
Base: Water
Sizes: 2.5L
VOC: Minimal